Device for making and sharpening rock-drills.



No. 826,004. PATENTED JULY 17,1906.

W. W. WORD. DEVICE FOR MAKING AND SHARPENING ROCK DRILLS.

APPLICATION FILED DEC. 22. 1905.

In venimg- M W W Inents 1n devices for nivrrnn STATES PATENT oFFIoE.

WILLIAM WV. WORD, OF SAN FRANCISCO, CALIFORNIA.

DEVICE FOR MAKING AND SHARPENING ROCK-DRILLS. V

Specification of Letters Patent.

Patented July 17, 1906.

To all whom it may concern:

Be it known that I, WILLIAM W. WORD, a citizen of the United States of America, residing at San Francisco, county of San Fran.- cisco, and State of California, have invented certain new and useful Improvements in Devices for Making and Sharpening Rock- Drills; and I hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to certain improve-.

making and sharpening rock-drills, as hereinafter fully described, and illustrated by drawings that accompany and form a part of this specification.

y improvements consist in movable dies or dollies that act on the edges of rock-drills commonly made of a cruciformsection, such dies being held in a horizontal plane when driven forward, but permitted to yield laterally to produce a drawing stroke, moving the material to some extent away from the center toward the points or corners that from the nature of the process are shortened and lack material, and consists especially in a manner of mounting and holding the dollies to secure their lateral movement without the aid of positive devices for that purpose.

The objects of my invention are to dispense with certain details heretofore required in such forging implements, to secure a combined forward and lateral motion of the dies or dollies that act on the edges of the drills, drawing the material from the center toward the points or corners, also to gain celerity in the operation of forging such drills and enable the completion of the edges at one heating while the metal is soft.

To these ends I provide devices as shown in the drawings, Figure I being a plan view on top of the dollies that act on the edges of the drills and their supports with their top plate removed; Fig. II the same; Fig. III, an enlarged view in perspective of the forward or acting ends of the dies or dollies; Fig. IV, a view in perspective or a completed drill-point.

In forging rock-drills all kinds of directacting or solid dollies without lateral move ment when acting endwise against a rockdrill produce curved anterior edges and a lack of material at the corners required to produce straight transverse edges when the drill is finished. This impediment is overa front end view of,

[ come by producing a compound motion of the dies or dollies, as set forth in Letters Patent of the United States No. 731,728, for improvements in rock-drill-forging apparatus, granted to me on the 23d day of June, 1902; but suc devices involve operative mechanical details to produce positive lateral movement of the dollies that form the edges of the drills and also demand hand control by an operator.

In my present invention a lateral drawing action of the dollies is produced without supplementary mechanism or effort of an attendant by means of a wedging action between the dollies produced by the transverse edges of the drill not being acted upon and by the form of the dollies in respect thereto.

Referring now to the drawings, 1 is a base or frame in which the dollies 2 and 3 are held. 4 and 5 are side bars or gibs against which the dollies 2 and 3 bear and slide. 7 and 8 are elastic or compressible springs (here shown as made of india-rubber) against which the bars 4 and 5 bear, as shown in Fig. I. A cover or cap 9 secures the Whole together, leaving the dollies 2 and 3 free to move together longitudinally when struck by a hammer-head 10 and driven forward against a drill end 12.

The drill ends 12 before being acted upon in the present process are rough-forged in the usual manner to a cruciform section by dies that act laterally on the bar, the edges being blunt and irregular, as indicated in Fig. I, and require finishing with straight angular edges, as shown in Fig. IV. The drill 12 when being operated upon by the dollies 2 and 3 is turned at intervals ninety degrees, so the cruciform edges are alternately acted upon by the dollies 2 and 3, the grooves 13 in the latter acting as matrices to produce true edges in straight lines. As, however, the ends of the rough-forged drills are curved, as shown in Fig. I, with a redundancy of metal at the center, direct blows of the dollies produce a want at the corners and the lines of the edges are not filled out as in Fig. IV.

en the dollies are driven forward by the hammer 10 and the grooves 13 come in con tact with the horizontal edges of the drill, the angular grooves 14 at the same time come in contact with the vertical edges 15 of the drill, and the dollies being free to spread by reason of the spring-cushions the dollies yield, as indicated by dotted lines in Fig. I, producing a drawing action or blow of the grooves 13,

vide for wear, the

said dollies adapted This latter movement draws the hot metal outward from the center and fulls or completes the corners 17, and when the drill 12 is turned ninety peated on the other edge, the work progressing in stages until both edges are complete and in one plane. To permit a free longitudinal action of the dollies 2 and 3 and to pro- I seats of the gibs or side bars 4 5 are recessed beyond the dollies, as shown at 6 in Fig. II. The vertical grooves 14 have the true right angle of the drill edges, which might otherwise change their relation when the grooves 13 were acting on the drill-point.

I claim- 1. In drill-forging apparatus, a pair of dollies movably mounted in a frame or support, to be driven forward by a hammer, and at the outer sides of these dollies elastic cushions or springs that permit them to spread and give a drawing stroke laterally, in the manner substantially as described.

2. In drill-forging apparatus, two movable degrees the operation is r e,

further office of maintaining a of the drills to dollies mounted in a frame or support, said dollies adapted to be driven forward and act on two edges of the drill, yielding lateral guides for the dollies and spring-cushions against which these guides bear, permitting the dollies to expand or move outward from the center, producing a drawing stroke upon the drill edges, substantially as specified.

3. In drill-forging apparatus, a pair of 01- lies movably mounted in a frame or support adapted to be driven forward by a hammer, their anterior ends grooved to form the edges be formed or sharpened and cross-grooved to admit one of the drill edges between the dollies, whereby the latter are spread, producing a drawing stroke away from the center of the drill, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM W. WORD.

Witnesses:

ALFRED A. EN UIsT, ELMER WrcKEs. 

